With Scott Morrison set to return to Perth this week for his latest pre-campaign stop to try to shore up support for the Coalition, punters think the Prime Minister has plenty of reasons to be nervous about his fortunes in the west.

If the latest odds from bookmakers are to be believed, some high profile Liberals will be looking for a new job by mid-May.

Attorney-General Christian Porter and Aged Care Minister Ken Wyatt have both been installed as the underdogs in their marginal seats of Pearce and Hasluck respectively, while Labor is also favoured to win Swan off backbench Liberal Steve Irons.

The bookies have also put Labor as strong favourite in Anne Aly's marginal seat of Cowan, while giving the Opposition a solid chance of snatching Stirling and Canning off the Liberals.

All up, Labor is favourite in eight of the 16 WA seats — despite currently holding just five of those electorates.

That reaffirms the trend in the wider betting markets ahead of the election, which are predicting a swing away from the Coalition and a victory for Bill Shorten and Labor.

But with about six weeks until voters are expected to go to the polls, what exactly are the betting markets predicting is likely to happen in WA?

Odds are against Christian Porter

Two major bookmakers are offering markets for every seat and through a series of calculations, the ABC has combined those to get the "implied probability" of an outcome from the betting odds.

In basic terms, that takes the decimalised betting odds, removes the bookmaker's profit margin and leaves you with the percentage chance of an outcome according to those original odds.

Percentage chance of winning by WA electorate

Electorate

Labor (%)

Coalition (%)

Brand

92.78

4.46

Burt

91.66

5.62

Canning

45.78

52.32

Cowan

74.59

22.42

Curtin

14.98

81.94

Durack

11.43

85.88

Forrest

7.62

89.68

Fremantle

91.79

6.4

Hasluck

67.55

30.19

Moore

13.64

84.42

O'Connor

15.39

83.13

Pearce

57.39

40.36

Perth

85.81

11.38

Stirling

45.76

52.43

Swan

59.69

38.3

Tangney

4.09

93.14

Data note: The percentages are derived by converting the raw odds given by two bookmakers to a percentage probability and averaging them out. The figures have had adjustments made by the bookmakers to give them an edge on both sides of the bet removed. This has been applied, without altering the probability implied by the raw odds, through a series of equations. The totals do not add up to 100 per cent because of the presence of minor parties in the betting odds.

Perhaps the most noteworthy result is in the outer-suburban electorate of Pearce, where Mr Porter faces an uphill battle according to the bookmakers.

They calculate the Attorney-General has just a 40 per cent chance of holding on amid a challenge from Labor's Kim Travers.

Mr Irons is given even less chance of winning in Swan, while Mr Wyatt is rated as less than a one-in-three chance of surviving in Hasluck.

The bookies have two seats close to a toss-up, with the Coalition slightly ahead in both Stirling, where sitting member Michael Keenan is retiring, and Andrew Hastie's seat of Canning.

The rest of the seats have a clear favourite, with the Liberals' Ben Morton rated the strongest chance of victory at more than 93 per cent.

It is important to note these odds will fluctuate and some factors that may influence the race — such as the Liberals and Nationals running against each other in O'Connor and Durack, or the presence of independent candidate Louise Stewart in the blue-ribbon conservative seat of Curtin — are yet to be factored in.

But, if the punters have it right, there will be much more red across the electoral map in a state that has long been a Liberal stronghold.